Method of treating carbid of calcium.



Nr'rn STATES CHARLES EMMANUEL YVONN METHOD EAU, OF 'PARIS, FRANCE.

0F TREATING CARBID OF CALCIUM.

SPECIFICATION forming part of Letters Application filed Jenner- 18,1900.Serial Patent No. e4s,e4s, dated Apr-i124, 1900.

ll 'o. 1,923- (No specimens.)

To all whom it may concern.-

Be it known that 1, CHARLES EMMANUEL YVONNEAU, a citizen of the FrenchRepublic,

residing at Paris, France, have invented certain new and usefulImprovements in Metheds of Treating Carbid of Calcium; and I do herebydeclare the following to be a full, clear, and exact d cription of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

In the manufacture of carbid of calcium in commercial form for use inapparatus for generating acetylene gas a great waste has resulted fromthe carbid being necessarily exposed during the crushing operation,which is a necessary step to making the carbid up into tablet orcartridge form, the percentage of loss being dependent upon thehygroscopic condition of the atmosphere.

The object of my present invention is to so treat the ordinary carbidprior to the crush-. ing operation that it will be entirely immuneagainst humidity in the atmosphere during its exposure. Exhaustiveexperiments have been made by me to discover some method or means forpreventing this waste. The carbid has been crushed in a. superheatedchamher, in a vacuum, and otherwise, with little or no success inproportion, to the expense of thesemethods. I found that the best possible results as regards. utility and inexpensiveness were obtained byproviding the ordinary carbid with a protective medium, a

practical exemplification of the process being as follows: I takeordinary calcium carbid as furnished to the trade and immerse the sameinto a substance indecomposable by the carbid, as oil, at a suitabletemperature until nearly or completely saturated. The oil penetratesthrough the pores of the carbid filling the same and rendering thecarbid perfectly immune to a hygroscopic state of the atmos phere. Thusthe carbid can be crushed irrespective of surroundings, with noperceptible loss, and at small expense.

Having thus described my invention, I claim- 1. In the process ofpreparing carbid of cal cium, saturating the carbid, preparatory todecomposable by'the carbid, to prevent de- 'composition during thecrushing operation, and then crushing it while so protectedifromdecomposition, substantially as specified.

2. In the process of preparing carbid of calcium, saturating theordinary carbid in oil, and then crushing it while so protected fromdegomposition, substantially as herein specifie In testimony whereofIaffix my signature in presence oftwo witnesses.

CHARLES EMMANUEL ivonniun.

Witnesses:

CHARLES CABANIS,

EDWARD P. MACLEAN.

the crushing operation, with a substance iii--

